Protein constituents of the eggshell: eggshell-specific matrix proteins

In this article, we review the results of recent proteomic and genomic analyses of eggshell matrix proteins and draw attention to the impact of these data on current understanding of eggshell formation and function. Eggshell-specific matrix proteins from avian (ovocleidins and ovocalyxins) and non-avian (paleovaterin) shells are discussed. Two possible roles for eggshell-specific matrix proteins have been proposed; both reflect the protective function of the eggshell in avian reproduction: regulation of eggshell mineralization and antimicrobial defense. An emerging concept is the dual role (mineralization/antimicrobial protection) that certain eggshell matrix proteins can play.     

从秦皇岛柳江盆地岩浆活动论其大地构造性质及成矿特征

秦皇岛柳江盆地自燕山运动以来，岩浆活动十分剧烈，岩浆岩广泛发育，说明它已从稳定区转化为活动区，成为后地台阶段的活化区，即地洼区。因而其成矿作用具有稳定型和治化型两类特征。     

矿化模型及研究动态综述

综合评述了矿化模型研究发展的历史和现状，指出了存在的问题和发展方向。     

Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China

The Kunyang rift lying on the western margin of the Yangtze platform is a rare Precambrian Fe-Cu mineralization zone. Wuding- Lufeng basin that is an important part of the zone is located on the west edge in the middle of the rift. The most important ore-hosting rocks are Mesoproterozoic dolomite rocks in the basin controlled by a ring fracture system, which is a fundamental structure of the basin. Plenty of silicate minerals and acicular apatite, feldspar phenocrysts and small vesicular, flown line and flown plane structures, melt inclusion and high temperature fluid inclusion found in most ore-hosting dolomites suggest that this kind of rocks could not be sedimentary dolomite, marble or hydrothermal carbonate rocks. The Zr/Hf and Nb/Ta values of the rocks are identical with those of associated mantle-derived rocks, and vary widely. For the monomineral dolomite, δ^18OSMOW‰=＋5.99 to ＋18.4 and δ^13CPDB‰ = -3.01 to ＋0.94, which fall within the range for all carbonatitic volcanic rocks of the world. As for the accessory minerals, the values of δ^18OSMOW‰ of magnetite （=＋3.47 to ＋5.99‰） are close to that of the mantle （〈5.7%）, and the δ^34S‰ values of sulfides （-5.09 to ＋5.78, averaging ＋1.50） are close to that of meteorite. For all the ore-bearing dolomite rocks, εNd = ＋0.19 to ＋2.27, and the calculated Isr=0.699143, while for the associated mantle-derived rocks, εnd = ＋3.18 to ＋3.72. All the data suggest that the mineral assemblage is not only igneous but also of metasomatic mantle origin. And the presence of acicular apatite indicates that the rocks were formed by magma rapidly cooling. And the phenocryst texture and vesicular, flown and ropy and pyroclastic structures suggest that the igneous rocks were extrusive. Therefore, the ore-bearing dolomite rocks are carbonatitic volcanic rocks. This conclusion implies that most iron and copper ore deposits hosted in the dolomite rocks should be of the carbonatite type.     

四川黑水下口锰矿矿床地质特征及成矿规律研究

黑水下口锰矿位于扬子地台西缘之松潘-甘孜地槽马尔康拗陷盆地,锰矿位于三叠系扎尕山组(T z g)中,受地层、构造、岩浆控制明显,属火山沉积受变质型锰矿床。     

缅甸板瓦矽卡岩型铅锌矿床成矿作用及找矿方向浅析

本文介绍了缅甸板瓦矿区矿床地质背景、矿床地质特征,分析了矿床的形成条件及成矿作用,并指明了该区找矿方向。     

Highly active brookite TiO2-assisted photocatalytic degradation of dyes under the simulated solar−UVA radiation

Brookite TiO_2 nanoparticles were synthesized by hydrothermal method and characterized by X-ray powder diffraction(XRD), diffuse reflectance UV–Visible spectroscopy(DRUV), and scanning electron microscopy(SEM). The obtained particles were spherical in shape with the diameter of about ～10 nm under the hydrothermal temperature of 175 °C. The photocatalytic performance of brookite was investigated in the photodegradation of dyes(rhodamine B and rose bengal) under UV-A radiation by low-power lamp. The activity of brookite and the photodegradation efficiency of dyes were estimated using a UV–Visible spectrophotometer and a total organic carbon(TOC) analyzer. Compared to anatase and rutile prepared by the similar synthesis procedure, brookite is highly active in terms of decolourization, aromatic ring opening, and mineralization.     

苏皖凹凸棒石粘土矿床成矿条件

苏皖凹凸棒石粘土矿床成矿时代为晚第三纪中新世，其赋矿层位主要为含矿岩系的顶部。通过对苏皖凹凸棒石粘土矿床成矿物质来源及成矿介质条件（ｐＨ值，氧化还原条件，温度及盐度等）的分析讨论，表明其成矿物质来自底板玄武岩（Ｎ＿１ＸＡ＿２），凹凸棒石粘土矿床便是玄武岩风化产物搬运到水盆地中通过沉积—成岩作用形成，与火山作用有关的热水溶液参与了成矿过程。其成矿介质为碱性，弱还原—还原，低盐度及低温的环境。     

云南省麻栗坡县某锡钨矿床成矿条件分析

云南省麻栗坡县某锡钨矿床位于滇东南南温河变质核杂岩矿聚区。在分析该矿床的地质特征基础上,分析了该矿床的成矿条件。结果表明,该矿床主要受华南褶皱系西南边缘的滇东南坳褶带,越北隆起之北缘,环老君山花岗岩体钨、锡多金属成矿带控制。     

新疆阿尔泰克朗盆地热液成矿时代的裂变径迹分析

应用裂变径迹技术研究成矿作用是一种新尝试。新疆克朗盆地各个矿区成矿流体包裹体均一温度变化于105~294℃,与锆石和磷灰石裂变径迹封闭温度基本一致,所以,裂变径迹方法用于可以应用于成矿作用研究。本文获得不同矿区6个锆石和17个磷灰石裂变径迹分析结果,其中锆石年龄为134 Ma~312 Ma,分属312 Ma,247Ma和158~134 Ma三个年龄组,是3个成矿期的体现;磷灰石年龄为30~130 Ma,是区内成矿作用结束后的热事件时代。因此,成矿作用不仅发生于海西期和印支期,而且发生于燕山期甚至喜山期。